android Multimedia实战（一）详解SurfaceView，TextureView之播放视频的四种方式

android Multimedia实战系列将聚焦于Android Multimedia模块，结合Android5.X到Android7.X或者到后来8.x 9.x最新Multimedia相关的API等，实现录制音视频，播放音视频，截图，录屏，编解码等实用功能！

下面不废话直接入正文：
github完整demo，欢迎star:https://github.com/WangShuo1143368701/VideoView
在Android中，我们有四种方式来实现视频的播放：
1、使用其自带的播放器。指定Action为ACTION_VIEW,Data为Uri，Type为其MIME类型。

2、使用VideoView来播放。在布局文件中使用VideoView结合MediaController来实现对其控制。

3、使用MediaPlayer类和SurfaceView来实现，这种方式很灵活。

4、使用MediaPlayer类和TextureView来实现，这种方式更灵活。

下面看代码示例：
1、调用其自带的播放器：

Uri uri = Uri.parse(Environment.getExternalStorageDirectory().getPath()+"/Test_Movie.m4v");     //调用系统自带的播放器        Intent intent = new Intent(Intent.ACTION_VIEW);        Log.v("URI:::::::::", uri.toString());        intent.setDataAndType(uri, "video/mp4");        startActivity(intent); 

2、使用VideoView来实现：

Uri uri = Uri.parse(Environment.getExternalStorageDirectory().getPath()+"/Test_Movie.m4v");    VideoView videoView = (VideoView)this.findViewById(R.id.video_view);    videoView.setMediaController(new MediaController(this));    videoView.setVideoURI(uri);    videoView.start();    videoView.requestFocus();

在介绍三四中方式之前我们先比较一下SurfaceView及TextureView

SurfaceView优点及缺点：
优点：可以在一个独立的线程中进行绘制，不会影响主线程
使用双缓冲机制，播放视频时画面更流畅

缺点：Surface不在View hierachy中，它的显示也不受View的属性控制，所以不能进行平移，缩放等变换，也不能放在其它ViewGroup中。SurfaceView 不能嵌套使用

TextureView优点及缺点：
优点：支持移动、旋转、缩放等动画，支持截图

缺点：必须在硬件加速的窗口中使用，占用内存比SurfaceView高，在5.0以前在主线程渲染，5.0以后有单独的渲染线程。

小结：
从性能和安全性角度出发，使用播放器优先选SurfaceView。

1、在android 7.0上系统surfaceview的性能比TextureView更有优势，支持对象的内容位置和包含的应用内容同步更新，平移、缩放不会产生黑边。 在7.0以下系统如果使用场景有动画效果，可以选择性使用TextureView

2、由于失效(invalidation)和缓冲的特性，TextureView增加了额外1~3帧的延迟显示画面更新

3、TextureView总是使用GL合成，而SurfaceView可以使用硬件overlay后端，可以占用更少的内存带宽，消耗更少的能量

4、TextureView的内部缓冲队列导致比SurfaceView使用更多的内存

5、SurfaceView： 内部自己持有surface，surface 创建、销毁、大小改变时系统来处理的，通过surfaceHolder 的callback回调通知。当画布创建好时，可以将surface绑定到MediaPlayer中。SurfaceView如果为用户可见的时候，创建SurfaceView的SurfaceHolder用于显示视频流解析的帧图片，如果发现SurfaceView变为用户不可见的时候，则立即销毁SurfaceView的SurfaceHolder，以达到节约系统资源的目的

3、使用MediaPlayer类和SurfaceView来实现

package com.ws.videoview.videoview.view;import android.content.Context;import android.graphics.PixelFormat;import android.media.AudioManager;import android.media.MediaPlayer;import android.media.MediaPlayer.OnInfoListener;import android.media.MediaPlayer.OnVideoSizeChangedListener;import android.net.Uri;import android.os.Build;import android.os.Handler;import android.os.Message;import android.text.TextUtils;import android.util.AttributeSet;import android.util.Log;import android.view.KeyEvent;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;import java.io.IOException;/** * Created by Shuo.Wang on 2017/4/25. */public class SurfaceVideoView extends SurfaceView implements Callback {    /** 定时暂停 */    private static final int HANDLER_MESSAGE_PARSE = 0;    /** 定时循环 */    private static final int HANDLER_MESSAGE_LOOP = 1;    private MediaPlayer.OnCompletionListener mOnCompletionListener;    private MediaPlayer.OnPreparedListener mOnPreparedListener;    private MediaPlayer.OnErrorListener mOnErrorListener;    private MediaPlayer.OnSeekCompleteListener mOnSeekCompleteListener;    private OnInfoListener mOnInfoListener;    private OnVideoSizeChangedListener mOnVideoSizeChangedListener;    private OnPlayStateListener mOnPlayStateListener;    private MediaPlayer mMediaPlayer = null;    private SurfaceHolder mSurfaceHolder = null;    private static final int STATE_ERROR = -1;    private static final int STATE_IDLE = 0;    private static final int STATE_PREPARING = 1;    private static final int STATE_PREPARED = 2;    private static final int STATE_PLAYING = 3;    private static final int STATE_PAUSED = 4;    /**     * PlaybackCompleted状态：文件正常播放完毕，而又没有设置循环播放的话就进入该状态，     * 并会触发OnCompletionListener的onCompletion     * ()方法。此时可以调用start()方法重新从头播放文件，也可以stop()停止MediaPlayer，或者也可以seekTo()来重新定位播放位置。     */    private static final int STATE_PLAYBACK_COMPLETED = 5;    /** Released/End状态：通过release()方法可以进入End状态 */    private static final int STATE_RELEASED = 5;    private int mCurrentState = STATE_IDLE;    private int mTargetState = STATE_IDLE;    private int mVideoWidth;    private int mVideoHeight;    //  private int mSurfaceWidth;    //  private int mSurfaceHeight;    //  private float mSystemVolumn = -1;    private int mDuration;    private Uri mUri;    //  SurfaceTextureAvailable    public SurfaceVideoView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        initVideoView();    }    public SurfaceVideoView(Context context) {        super(context);        initVideoView();    }    public SurfaceVideoView(Context context, AttributeSet attrs) {        super(context, attrs);        initVideoView();    }    @SuppressWarnings("deprecation")    protected void initVideoView() {        //      mTryCount = 0;        mVideoWidth = 0;        mVideoHeight = 0;        getHolder().setFormat(PixelFormat.RGBA_8888); // PixelFormat.RGB_565        getHolder().addCallback(this);        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) {            getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);        }        setFocusable(true);        setFocusableInTouchMode(true);        requestFocus();        mCurrentState = STATE_IDLE;        mTargetState = STATE_IDLE;    }    /** 更新音量 */    public static float getSystemVolumn(Context context) {        if (context != null) {            try {                AudioManager mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);                int maxVolumn = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);                return mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC) * 1.0F / maxVolumn;            } catch (UnsupportedOperationException e) {            }        }        return 0.5F;    }    public void setOnInfoListener(OnInfoListener l) {        mOnInfoListener = l;    }    public void setOnVideoSizeChangedListener(OnVideoSizeChangedListener l) {        mOnVideoSizeChangedListener = l;    }    public void setOnPreparedListener(MediaPlayer.OnPreparedListener l) {        mOnPreparedListener = l;    }    public void setOnErrorListener(MediaPlayer.OnErrorListener l) {        mOnErrorListener = l;    }    public void setOnPlayStateListener(OnPlayStateListener l) {        mOnPlayStateListener = l;    }    public void setOnSeekCompleteListener(MediaPlayer.OnSeekCompleteListener l) {        mOnSeekCompleteListener = l;    }    public static interface OnPlayStateListener {        public void onStateChanged(boolean isPlaying);    }    public void setOnCompletionListener(MediaPlayer.OnCompletionListener l) {        mOnCompletionListener = l;    }    public void setVideoPath(String path) {        // && MediaUtils.isNative(path)        if (!TextUtils.isEmpty(path)) {            mTargetState = STATE_PREPARED;            openVideo(Uri.parse(path));        }    }    public int getVideoWidth() {        return mVideoWidth;    }    public int getVideoHeight() {        return mVideoHeight;    }    public void reOpen() {        mTargetState = STATE_PREPARED;        openVideo(mUri);    }    public int getDuration() {        return mDuration;    }    /** 重试 */    private void tryAgain(Exception e) {        mCurrentState = STATE_ERROR;        openVideo(mUri);    }    public void start() {        mTargetState = STATE_PLAYING;        //可用状态{Prepared, Started, Paused, PlaybackCompleted}        if (mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYING || mCurrentState == STATE_PLAYBACK_COMPLETED)) {            try {                if (!isPlaying())                    mMediaPlayer.start();                mCurrentState = STATE_PLAYING;                if (mOnPlayStateListener != null)                    mOnPlayStateListener.onStateChanged(true);            } catch (IllegalStateException e) {                tryAgain(e);            } catch (Exception e) {                tryAgain(e);            }        }    }    public void pause() {        mTargetState = STATE_PAUSED;        //可用状态{Started, Paused}        if (mMediaPlayer != null && (mCurrentState == STATE_PLAYING)) {            try {                mMediaPlayer.pause();                mCurrentState = STATE_PAUSED;                if (mOnPlayStateListener != null)                    mOnPlayStateListener.onStateChanged(false);            } catch (IllegalStateException e) {                tryAgain(e);            } catch (Exception e) {                tryAgain(e);            }        }    }    /** 处理音量键 */    public void dispatchKeyEvent(Context context, KeyEvent event) {        switch (event.getKeyCode()) {            case KeyEvent.KEYCODE_VOLUME_DOWN:            case KeyEvent.KEYCODE_VOLUME_UP:                setVolume(getSystemVolumn(context));                break;        }    }    public void setVolume(float volume) {        //可用状态{Idle, Initialized, Stopped, Prepared, Started, Paused, PlaybackCompleted}        if (mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PLAYING || mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYBACK_COMPLETED)) {            try {                mMediaPlayer.setVolume(volume, volume);            } catch (Exception e) {            }        }    }    //  public float getSystemVolume() {    //      return mSystemVolumn;    //  }    public void setLooping(boolean looping) {        //可用状态{Idle, Initialized, Stopped, Prepared, Started, Paused, PlaybackCompleted}        if (mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PLAYING || mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYBACK_COMPLETED)) {            try {                mMediaPlayer.setLooping(looping);            } catch (Exception e) {            }        }    }    public void seekTo(int msec) {        //可用状态{Prepared, Started, Paused, PlaybackCompleted}        if (mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PLAYING || mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYBACK_COMPLETED)) {            try {                if (msec < 0)                    msec = 0;                mMediaPlayer.seekTo(msec);            } catch (IllegalStateException e) {            } catch (Exception e) {            }        }    }    /** 获取当前播放位置 */    public int getCurrentPosition() {        int position = 0;        //可用状态{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}        if (mMediaPlayer != null) {            switch (mCurrentState) {                case STATE_PLAYBACK_COMPLETED:                    position = getDuration();                    break;                case STATE_PLAYING:                case STATE_PAUSED:                    try {                        position = mMediaPlayer.getCurrentPosition();                    } catch (IllegalStateException e) {                    } catch (Exception e) {                    }                    break;            }        }        return position;    }    public boolean isPlaying() {        //可用状态{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}        if (mMediaPlayer != null && mCurrentState == STATE_PLAYING) {            try {                return mMediaPlayer.isPlaying();            } catch (IllegalStateException e) {            } catch (Exception e) {            }        }        return false;    }    /** 调用release方法以后MediaPlayer无法再恢复使用 */    public void release() {        mTargetState = STATE_RELEASED;        mCurrentState = STATE_RELEASED;        if (mMediaPlayer != null) {            try {                mMediaPlayer.release();            } catch (IllegalStateException e) {            } catch (Exception e) {            }            mMediaPlayer = null;        }    }    public SurfaceHolder getSurfaceHolder() {        return mSurfaceHolder;    }    public void openVideo(Uri uri) {        if (uri == null || mSurfaceHolder == null || getContext() == null) {            // not ready for playback just yet, will try again later            if (mSurfaceHolder == null && uri != null) {                mUri = uri;            }            Log.e("openVideo ws--->","openVideo return");            return;        }        mUri = uri;        mDuration = 0;        //Idle 状态：当使用new()方法创建一个MediaPlayer对象或者调用了其reset()方法时，该MediaPlayer对象处于idle状态。        //End 状态：通过release()方法可以进入End状态，只要MediaPlayer对象不再被使用，就应当尽快将其通过release()方法释放掉        //Initialized 状态：这个状态比较简单，MediaPlayer调用setDataSource()方法就进入Initialized状态，表示此时要播放的文件已经设置好了。        //Prepared 状态：初始化完成之后还需要通过调用prepare()或prepareAsync()方法，这两个方法一个是同步的一个是异步的，只有进入Prepared状态，才表明MediaPlayer到目前为止都没有错误，可以进行文件播放。        Exception exception = null;        try {            if (mMediaPlayer == null) {                mMediaPlayer = new MediaPlayer();                mMediaPlayer.setOnPreparedListener(mPreparedListener);                mMediaPlayer.setOnCompletionListener(mCompletionListener);                mMediaPlayer.setOnErrorListener(mErrorListener);                mMediaPlayer.setOnVideoSizeChangedListener(mVideoSizeChangedListener);                mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);                mMediaPlayer.setOnSeekCompleteListener(mSeekCompleteListener);                mMediaPlayer.setOnInfoListener(mInfoListener);                //          mMediaPlayer.setScreenOnWhilePlaying(true);                //              mMediaPlayer.setVolume(mSystemVolumn, mSystemVolumn);                mMediaPlayer.setDisplay(mSurfaceHolder);            } else {                mMediaPlayer.reset();            }            mMediaPlayer.setDataSource(getContext(), uri);            //          if (mLooping)            //              mMediaPlayer.setLooping(true);//循环播放            mMediaPlayer.prepareAsync();            // we don't set the target state here either, but preserve the            // target state that was there before.            mCurrentState = STATE_PREPARING;        } catch (IOException ex) {            exception = ex;        } catch (IllegalArgumentException ex) {            exception = ex;        } catch (Exception ex) {            exception = ex;        }        if (exception != null) {            mCurrentState = STATE_ERROR;            if (mErrorListener != null)                mErrorListener.onError(mMediaPlayer, MediaPlayer.MEDIA_ERROR_UNKNOWN, 0);        }    }    private MediaPlayer.OnCompletionListener mCompletionListener = new MediaPlayer.OnCompletionListener() {        @Override        public void onCompletion(MediaPlayer mp) {            mCurrentState = STATE_PLAYBACK_COMPLETED;            //          mTargetState = STATE_PLAYBACK_COMPLETED;            if (mOnCompletionListener != null)                mOnCompletionListener.onCompletion(mp);        }    };    MediaPlayer.OnPreparedListener mPreparedListener = new MediaPlayer.OnPreparedListener() {        @Override        public void onPrepared(MediaPlayer mp) {            //必须是正常状态            if (mCurrentState == STATE_PREPARING) {                mCurrentState = STATE_PREPARED;                try {                    mDuration = mp.getDuration();                } catch (IllegalStateException e) {                }                try {                    mVideoWidth = mp.getVideoWidth();                    mVideoHeight = mp.getVideoHeight();                } catch (IllegalStateException e) {                }                switch (mTargetState) {                    case STATE_PREPARED:                        if (mOnPreparedListener != null)                            mOnPreparedListener.onPrepared(mMediaPlayer);                        break;                    case STATE_PLAYING:                        start();                        break;                }            }        }    };    OnVideoSizeChangedListener mVideoSizeChangedListener = new OnVideoSizeChangedListener() {        @Override        public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {            mVideoWidth = width;            mVideoHeight = height;            if (mOnVideoSizeChangedListener != null)                mOnVideoSizeChangedListener.onVideoSizeChanged(mp, width, height);        }    };    OnInfoListener mInfoListener = new OnInfoListener() {        @Override        public boolean onInfo(MediaPlayer mp, int what, int extra) {            if (mOnInfoListener != null)                mOnInfoListener.onInfo(mp, what, extra);            return false;        }    };    private MediaPlayer.OnSeekCompleteListener mSeekCompleteListener = new MediaPlayer.OnSeekCompleteListener() {        @Override        public void onSeekComplete(MediaPlayer mp) {            if (mOnSeekCompleteListener != null)                mOnSeekCompleteListener.onSeekComplete(mp);        }    };    private MediaPlayer.OnErrorListener mErrorListener = new MediaPlayer.OnErrorListener() {        @Override        public boolean onError(MediaPlayer mp, int framework_err, int impl_err) {            mCurrentState = STATE_ERROR;            //          mTargetState = STATE_ERROR;            //FIX，可以考虑出错以后重新开始            if (mOnErrorListener != null)                mOnErrorListener.onError(mp, framework_err, impl_err);            return true;        }    };    /** 是否可用 */    public boolean isPrepared() {        return mMediaPlayer != null && (mCurrentState == STATE_PREPARED);    }    public boolean isComplate(){        return mMediaPlayer != null && (mCurrentState == STATE_PLAYBACK_COMPLETED);    }    /** 是否已经释放 */    public boolean isRelease() {        return mMediaPlayer == null || mCurrentState == STATE_IDLE || mCurrentState == STATE_ERROR || mCurrentState == STATE_RELEASED;    }    private Handler mVideoHandler = new Handler() {        @Override        public void handleMessage(Message msg) {            switch (msg.what) {                case HANDLER_MESSAGE_PARSE:                    pause();                    break;                case HANDLER_MESSAGE_LOOP:                    if (isPlaying()) {                        seekTo(msg.arg1);                        sendMessageDelayed(mVideoHandler.obtainMessage(HANDLER_MESSAGE_LOOP, msg.arg1, msg.arg2), msg.arg2);                    }                    break;                default:                    break;            }            super.handleMessage(msg);        }    };    /** 定时暂停 */    public void pauseDelayed(int delayMillis) {        if (mVideoHandler.hasMessages(HANDLER_MESSAGE_PARSE))            mVideoHandler.removeMessages(HANDLER_MESSAGE_PARSE);        mVideoHandler.sendEmptyMessageDelayed(HANDLER_MESSAGE_PARSE, delayMillis);    }    /** 暂停并且清除定时任务 */    public void pauseClearDelayed() {        pause();        if (mVideoHandler.hasMessages(HANDLER_MESSAGE_PARSE))            mVideoHandler.removeMessages(HANDLER_MESSAGE_PARSE);        if (mVideoHandler.hasMessages(HANDLER_MESSAGE_LOOP))            mVideoHandler.removeMessages(HANDLER_MESSAGE_LOOP);    }    /** 区域内循环播放 */    public void loopDelayed(int startTime, int endTime) {        if (mVideoHandler.hasMessages(HANDLER_MESSAGE_PARSE))            mVideoHandler.removeMessages(HANDLER_MESSAGE_PARSE);        if (mVideoHandler.hasMessages(HANDLER_MESSAGE_LOOP))            mVideoHandler.removeMessages(HANDLER_MESSAGE_LOOP);        int delayMillis = endTime - startTime;        seekTo(startTime);        if (!isPlaying())            start();        if (mVideoHandler.hasMessages(HANDLER_MESSAGE_LOOP))            mVideoHandler.removeMessages(HANDLER_MESSAGE_LOOP);        mVideoHandler.sendMessageDelayed(mVideoHandler.obtainMessage(HANDLER_MESSAGE_LOOP, getCurrentPosition(), delayMillis), delayMillis);    }    @Override    public void surfaceCreated(SurfaceHolder holder) {        boolean needReOpen = (mSurfaceHolder == null);        mSurfaceHolder = holder;        if (needReOpen) {            reOpen();        }    }    @Override    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {        mSurfaceHolder = holder;    }    @Override    public void surfaceDestroyed(SurfaceHolder holder) {        mSurfaceHolder = null;        release();    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);    }}

4、使用MediaPlayer类和TextureView来实现，这种方式更灵活。

TextureView特有API
1 getSurfaceTexture()
This method returns the SurfaceTexture used by this view.

2 getBitmap(int width, int height)
This method returns Returns a Bitmap representation of the content of the associated surface texture.

3 getTransform(Matrix transform)
This method returns the transform associated with this texture view.

4 isOpaque()
This method indicates whether this View is opaque.

5 lockCanvas()
This method start editing the pixels in the surface

6 setOpaque(boolean opaque)
This method indicates whether the content of this TextureView is opaque.

7 setTransform(Matrix transform)
This method sets the transform to associate with this texture view.

8 unlockCanvasAndPost(Canvas canvas)
This method finish editing pixels in the surface.

9 setAlpha和setRotation

package com.ws.videoview.videoview.view;/** * Created by Shuo.Wang on 2017/4/25. */import android.content.Context;import android.graphics.SurfaceTexture;import android.media.AudioManager;import android.media.MediaPlayer;import android.net.Uri;import android.os.Handler;import android.os.Message;import android.util.AttributeSet;import android.view.Surface;import android.view.TextureView;import java.io.IOException;public class TextureVideoView extends TextureView implements TextureView.SurfaceTextureListener {    private MediaPlayer.OnCompletionListener mOnCompletionListener;    private MediaPlayer.OnPreparedListener mOnPreparedListener;    private MediaPlayer.OnErrorListener mOnErrorListener;    private MediaPlayer.OnSeekCompleteListener mOnSeekCompleteListener;    private OnPlayStateListener mOnPlayStateListener;    private MediaPlayer mMediaPlayer = null;    private SurfaceTexture mSurfaceHolder = null;    private static final int STATE_ERROR = -1;    private static final int STATE_IDLE = 0;    private static final int STATE_PREPARING = 1;    private static final int STATE_PREPARED = 2;    private static final int STATE_PLAYING = 3;    private static final int STATE_PAUSED = 4;    private static final int STATE_STOP = 5;    /**     * PlaybackCompleted状态：文件正常播放完毕，而又没有设置循环播放的话就进入该状态，     * 并会触发OnCompletionListener的onCompletion     * ()方法。此时可以调用start()方法重新从头播放文件，也可以stop()停止MediaPlayer，或者也可以seekTo()来重新定位播放位置。     */    private static final int STATE_PLAYBACK_COMPLETED = 5;    /** Released/End状态：通过release()方法可以进入End状态 */    private static final int STATE_RELEASED = 5;    private int mCurrentState = STATE_IDLE;    private int mTargetState = STATE_IDLE;    private int mVideoWidth;    private int mVideoHeight;    //  private int mSurfaceWidth;    //  private int mSurfaceHeight;    private float mVolumn = -1;    private int mDuration;    private Uri mUri;    //  SurfaceTextureAvailable    public TextureVideoView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        initVideoView();    }    public TextureVideoView(Context context) {        super(context);        initVideoView();    }    public TextureVideoView(Context context, AttributeSet attrs) {        super(context, attrs);        initVideoView();    }    public MediaPlayer getMediaPlayer(){        return mMediaPlayer;    }    protected void initVideoView() {        try {            AudioManager mAudioManager = (AudioManager) getContext().getSystemService(Context.AUDIO_SERVICE);            mVolumn = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);        } catch (UnsupportedOperationException e) {        }        //      mTryCount = 0;        mVideoWidth = 0;        mVideoHeight = 0;        setSurfaceTextureListener(this);        //      setFocusable(true);        //      setFocusableInTouchMode(true);        //      requestFocus();        mCurrentState = STATE_IDLE;        mTargetState = STATE_IDLE;    }    public void setOnPreparedListener(MediaPlayer.OnPreparedListener l) {        mOnPreparedListener = l;    }    public void setOnErrorListener(MediaPlayer.OnErrorListener l) {        mOnErrorListener = l;    }    public void setOnPlayStateListener(OnPlayStateListener l) {        mOnPlayStateListener = l;    }    public void setOnSeekCompleteListener(MediaPlayer.OnSeekCompleteListener l) {        mOnSeekCompleteListener = l;    }    public static interface OnPlayStateListener {        public void onStateChanged(boolean isPlaying);    }    public void setOnCompletionListener(MediaPlayer.OnCompletionListener l) {        mOnCompletionListener = l;    }    public void setVideoPath(String path) {//      if (StringUtils.isNotEmpty(path) && MediaUtils.isNative(path)) {        mTargetState = STATE_PREPARED;        openVideo(Uri.parse(path));//      }    }    public int getVideoWidth() {        return mVideoWidth;    }    public int getVideoHeight() {        return mVideoHeight;    }    public void reOpen() {        mTargetState = STATE_PREPARED;        openVideo(mUri);    }    public int getDuration() {        return mDuration;    }    /** 重试 */    private void tryAgain(Exception e) {        e.printStackTrace();        mCurrentState = STATE_ERROR;        openVideo(mUri);    }    public void start() {        mTargetState = STATE_PLAYING;        //可用状态{Prepared, Started, Paused, PlaybackCompleted}        if (mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYING || mCurrentState == STATE_PLAYBACK_COMPLETED)) {            try {                if (!isPlaying())                    mMediaPlayer.start();                mCurrentState = STATE_PLAYING;                if (mOnPlayStateListener != null)                    mOnPlayStateListener.onStateChanged(true);            } catch (IllegalStateException e) {                tryAgain(e);            } catch (Exception e) {                tryAgain(e);            }        }    }    public void pause() {        mTargetState = STATE_PAUSED;        //可用状态{Started, Paused}        if (mMediaPlayer != null && (mCurrentState == STATE_PLAYING || mCurrentState == STATE_PAUSED)) {            try {                mMediaPlayer.pause();                mCurrentState = STATE_PAUSED;                if (mOnPlayStateListener != null)                    mOnPlayStateListener.onStateChanged(false);            } catch (IllegalStateException e) {                tryAgain(e);            } catch (Exception e) {                tryAgain(e);            }        }    }    public void stop(){        mTargetState = STATE_STOP;        if (mMediaPlayer != null && (mCurrentState == STATE_PLAYING || mCurrentState == STATE_PAUSED)) {            try {                mMediaPlayer.stop();                mCurrentState = STATE_STOP;                if (mOnPlayStateListener != null)                    mOnPlayStateListener.onStateChanged(false);            } catch (IllegalStateException e) {                tryAgain(e);            } catch (Exception e) {                tryAgain(e);            }        }    }    public void setVolume(float volume) {        //可用状态{Idle, Initialized, Stopped, Prepared, Started, Paused, PlaybackCompleted}        if (mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PLAYING || mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYBACK_COMPLETED)) {            try {                mMediaPlayer.setVolume(volume, volume);            } catch (Exception e) {                e.printStackTrace();            }        }    }    public void setLooping(boolean looping) {        //可用状态{Idle, Initialized, Stopped, Prepared, Started, Paused, PlaybackCompleted}        if (mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PLAYING || mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYBACK_COMPLETED)) {            try {                mMediaPlayer.setLooping(looping);            } catch (Exception e) {                e.printStackTrace();            }        }    }    public void seekTo(int msec) {        //可用状态{Prepared, Started, Paused, PlaybackCompleted}        if (mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PLAYING || mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYBACK_COMPLETED)) {            try {                if (msec < 0)                    msec = 0;                mMediaPlayer.seekTo(msec);            } catch (IllegalStateException e) {                e.printStackTrace();            } catch (Exception e) {                e.printStackTrace();            }        }    }    /** 获取当前播放位置 */    public int getCurrentPosition() {        int position = 0;        //可用状态{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}        if (mMediaPlayer != null) {            switch (mCurrentState) {                case STATE_PLAYBACK_COMPLETED:                    position = getDuration();                    break;                case STATE_PLAYING:                case STATE_PAUSED:                    try {                        position = mMediaPlayer.getCurrentPosition();                    } catch (IllegalStateException e) {                        e.printStackTrace();                    } catch (Exception e) {                        e.printStackTrace();                    }                    break;            }        }        return position;    }    public boolean isPlaying() {        //可用状态{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}        if (mMediaPlayer != null && mCurrentState == STATE_PLAYING) {            try {                return mMediaPlayer.isPlaying();            } catch (IllegalStateException e) {                e.printStackTrace();            } catch (Exception e) {                e.printStackTrace();            }        }        return false;    }    /** 调用release方法以后MediaPlayer无法再恢复使用 */    public void release() {        mTargetState = STATE_RELEASED;        mCurrentState = STATE_RELEASED;        if (mMediaPlayer != null) {            try {                mMediaPlayer.release();            } catch (IllegalStateException e) {                e.printStackTrace();            } catch (Exception e) {                e.printStackTrace();            }            mMediaPlayer = null;        }    }    public void openVideo(Uri uri) {        if (uri == null || mSurfaceHolder == null || getContext() == null) {            // not ready for playback just yet, will try again later            if (mSurfaceHolder == null && uri != null) {                mUri = uri;            }            return;        }        mUri = uri;        mDuration = 0;        //Idle 状态：当使用new()方法创建一个MediaPlayer对象或者调用了其reset()方法时，该MediaPlayer对象处于idle状态。        //End 状态：通过release()方法可以进入End状态，只要MediaPlayer对象不再被使用，就应当尽快将其通过release()方法释放掉        //Initialized 状态：这个状态比较简单，MediaPlayer调用setDataSource()方法就进入Initialized状态，表示此时要播放的文件已经设置好了。        //Prepared 状态：初始化完成之后还需要通过调用prepare()或prepareAsync()方法，这两个方法一个是同步的一个是异步的，只有进入Prepared状态，才表明MediaPlayer到目前为止都没有错误，可以进行文件播放。        Exception exception = null;        try {            if (mMediaPlayer == null) {                mMediaPlayer = new MediaPlayer();                mMediaPlayer.setOnPreparedListener(mPreparedListener);                mMediaPlayer.setOnCompletionListener(mCompletionListener);                mMediaPlayer.setOnErrorListener(mErrorListener);                mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);                mMediaPlayer.setOnSeekCompleteListener(mSeekCompleteListener);                //          mMediaPlayer.setScreenOnWhilePlaying(true);                mMediaPlayer.setVolume(mVolumn, mVolumn);                mMediaPlayer.setSurface(new Surface(mSurfaceHolder));            } else {                mMediaPlayer.reset();            }            mMediaPlayer.setDataSource(getContext(), uri);            //          if (mLooping)            //              mMediaPlayer.setLooping(true);//循环播放            mMediaPlayer.prepareAsync();            // we don't set the target state here either, but preserve the            // target state that was there before.            mCurrentState = STATE_PREPARING;        } catch (IOException ex) {            exception = ex;        } catch (IllegalArgumentException ex) {            exception = ex;        } catch (Exception ex) {            exception = ex;        }        if (exception != null) {            exception.printStackTrace();            mCurrentState = STATE_ERROR;            if (mErrorListener != null)                mErrorListener.onError(mMediaPlayer, MediaPlayer.MEDIA_ERROR_UNKNOWN, 0);        }    }    private MediaPlayer.OnCompletionListener mCompletionListener = new MediaPlayer.OnCompletionListener() {        @Override        public void onCompletion(MediaPlayer mp) {            mCurrentState = STATE_PLAYBACK_COMPLETED;            //          mTargetState = STATE_PLAYBACK_COMPLETED;            if (mOnCompletionListener != null)                mOnCompletionListener.onCompletion(mp);        }    };    MediaPlayer.OnPreparedListener mPreparedListener = new MediaPlayer.OnPreparedListener() {        @Override        public void onPrepared(MediaPlayer mp) {            //必须是正常状态            if (mCurrentState == STATE_PREPARING) {                mCurrentState = STATE_PREPARED;                try {                    mDuration = mp.getDuration();                } catch (IllegalStateException e) {                    e.printStackTrace();                }                try {                    mVideoWidth = mp.getVideoWidth();                    mVideoHeight = mp.getVideoHeight();                } catch (IllegalStateException e) {                    e.printStackTrace();                }                switch (mTargetState) {                    case STATE_PREPARED:                        if (mOnPreparedListener != null)                            mOnPreparedListener.onPrepared(mMediaPlayer);                        break;                    case STATE_PLAYING:                        start();                        break;                }            }        }    };    private MediaPlayer.OnSeekCompleteListener mSeekCompleteListener = new MediaPlayer.OnSeekCompleteListener() {        @Override        public void onSeekComplete(MediaPlayer mp) {            if (mOnSeekCompleteListener != null)                mOnSeekCompleteListener.onSeekComplete(mp);        }    };    private MediaPlayer.OnErrorListener mErrorListener = new MediaPlayer.OnErrorListener() {        @Override        public boolean onError(MediaPlayer mp, int framework_err, int impl_err) {            mCurrentState = STATE_ERROR;            //          mTargetState = STATE_ERROR;            //FIX，可以考虑出错以后重新开始            if (mOnErrorListener != null)                mOnErrorListener.onError(mp, framework_err, impl_err);            return true;        }    };    @Override    public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {        boolean needReOpen = (mSurfaceHolder == null);        mSurfaceHolder = surface;        if (needReOpen) {            reOpen();        }    }    @Override    public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {    }    @Override    public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {        //画布失效        mSurfaceHolder = null;        release();        return true;    }    @Override    public void onSurfaceTextureUpdated(SurfaceTexture surface) {    }    /** 是否可用 */    public boolean isPrepared() {        //|| mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYING        return mMediaPlayer != null && (mCurrentState == STATE_PREPARED);    }    //  /** 是否能即可播放 */    //  public boolean canStart() {    //      return mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PAUSED);    //  }    private static final int HANDLER_MESSAGE_PARSE = 0;    private static final int HANDLER_MESSAGE_LOOP = 1;    private Handler mVideoHandler = new Handler() {        @Override        public void handleMessage(Message msg) {            switch (msg.what) {                case HANDLER_MESSAGE_PARSE:                    pause();                    break;                case HANDLER_MESSAGE_LOOP:                    if (isPlaying()) {                        seekTo(msg.arg1);                        sendMessageDelayed(mVideoHandler.obtainMessage(HANDLER_MESSAGE_LOOP, msg.arg1, msg.arg2), msg.arg2);                    }                    break;                default:                    break;            }            super.handleMessage(msg);        }    };    /** 定时暂停 */    public void pauseDelayed(int delayMillis) {        if (mVideoHandler.hasMessages(HANDLER_MESSAGE_PARSE))            mVideoHandler.removeMessages(HANDLER_MESSAGE_PARSE);        mVideoHandler.sendEmptyMessageDelayed(HANDLER_MESSAGE_PARSE, delayMillis);    }    /** 暂停并且清除定时任务 */    public void pauseClearDelayed() {        pause();        if (mVideoHandler.hasMessages(HANDLER_MESSAGE_PARSE))            mVideoHandler.removeMessages(HANDLER_MESSAGE_PARSE);        if (mVideoHandler.hasMessages(HANDLER_MESSAGE_LOOP))            mVideoHandler.removeMessages(HANDLER_MESSAGE_LOOP);    }    /** 区域内循环播放 */    public void loopDelayed(int startTime, int endTime) {        int delayMillis = endTime - startTime;        seekTo(startTime);        if (!isPlaying())            start();        if (mVideoHandler.hasMessages(HANDLER_MESSAGE_LOOP))            mVideoHandler.removeMessages(HANDLER_MESSAGE_LOOP);        mVideoHandler.sendMessageDelayed(mVideoHandler.obtainMessage(HANDLER_MESSAGE_LOOP, getCurrentPosition(), delayMillis), delayMillis);    }}